Philips Master GreenPower 600W / 400 Volt HPS Pro EL Lamp - High-Efficacy Dual Spectrum HPS
Best for: Growers running a 400V HPS ballast and fixture who want higher efficacy than a standard 230V/240V lamp can offer at the same wattage.
Our thoughts
400V lamps get more usable light out of the same 600W than their 230V equivalents, which is exactly why commercial growers standardised on them. This Philips version is one of the more efficient options in that bracket, but it's strictly for 400V ballasts - don't try to run it on standard mains-voltage kit.
The Philips Master GreenPower 600W/400V HPS Pro EL is a single-ended, dual-spectrum high-pressure sodium lamp designed to run on 400V ballasts, which deliver higher efficacy per watt than the more common 230V/240V setup. It uses an E40 ceramic socket fitting and is heavily used in commercial horticulture, including professional food-growing operations, where consistent bloom-phase output matters for yield.
Philips rates this lamp at approximately 85,550 lumens with a luminous efficacy of around 142 lm/W and a PPF output of roughly 1120 µmol/s, at a colour temperature of about 2000K. The dual-spectrum design blends the red/orange HPS output with a broader spectral spread than a pure Son-T lamp, aimed at supporting weight gain through the bloom phase specifically. Typical coverage for a fixture running this lamp is in the region of 100x100cm to 120x120cm, depending on hanging height and reflector.
How it compares
400V dual-spectrum HPS lamps are the format professional growers moved to when chasing efficiency gains over standard 240V single-ended lamps.
- The 400V format consistently delivers higher lm/W efficacy than an equivalent 230V/240V 600W lamp (such as Philips' own Son-T PIA CG-T version), which is the main reason commercial operations standardised on it.
- Osram and Sylvania both offer comparable 600W/400V dual-spectrum HPS lamps in the same output bracket, making this a competitive rather than unique category.
- Against a 600W-class LED fixture, this lamp is far cheaper to buy but runs hotter and needs a separate ballast and reflector, so total running costs depend heavily on your electricity rate and cooling setup.
If you're already set up for 400V, this lamp gives you a genuine efficiency step up over standard-voltage HPS at a broadly similar bulb price.
Usage guidance
Confirm your ballast is rated for 400V before fitting this lamp - it will not run correctly on a 230V/240V system.
Fitting
Screw into an E40 ceramic socket connected to a compatible 400V ballast and reflector, handling the lamp by its base rather than the glass.
Coverage and hanging
Position for roughly a 100x100cm to 120x120cm footprint depending on your reflector, adjusting hanging height to manage heat and light intensity at the canopy.
Lifespan management
Rated lifespan for lamps in this class is typically in the region of a year of regular flowering-cycle use before output drops enough to justify replacement - track your hours rather than relying on the lamp until it fails outright.
Technical specifications
- Lamp type: Single-ended, dual-spectrum high-pressure sodium (HPS)
- Wattage: 600W
- Voltage: 400V
- Lumen output: Approx. 85,550 lm
- Efficacy: Approx. 142 lm/W
- PPF: Approx. 1120 µmol/s
- Colour temperature: Approx. 2000K
- Fitting: E40 ceramic socket
- Typical coverage: Approx. 100x100cm to 120x120cm
- Requires: Compatible 400V ballast and reflector (sold separately)
- Brand: Philips
Who this is for
- Growers with a 400V HPS ballast who want the efficiency gains that voltage format offers
- Commercial and professional growers who've standardised on 400V for bloom-phase lighting
- Anyone upgrading from a 230V/240V setup and investing in 400V infrastructure at the same time
- Growers who want dual-spectrum HPS output rather than pure Son-T red/orange light
Not compatible with standard 230V/240V ballasts - check your voltage before ordering.
Our take
This is a genuinely more efficient way to run 600W HPS than the standard-voltage version, and the efficacy figures back that up rather than just relying on brand reputation. It's aimed squarely at growers who've already committed to 400V infrastructure and want the best lamp to put in it.
Delivers reliable performance for 600W setups. One to consider if you're already running 400V kit and want the efficiency edge that comes with it.
